You can access your Office 365 or other Exchange-based email using the web browser version of Microsoft Outlook, Outlook Web App and using the desktop versions of Outlook, which provide an optimized email and collaboration experience.
Some people who have been recently upgraded from the pre-upgrade version of Office 365 are having connectivity problems with Outlook. For help fixing these problems, see Fix email connectivity problems after Office 365 upgrade. If you’re an Office 365 admin, see this Office 365 Community post, Fix Outlook connection problems after Office 365 upgrade.
These articles can help you get started.
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